Popcorn sieve



FIG. 1 is a top perspective view of a popcorn sieve incorporating my new design;

FIG. 2 is a bottom plan view of the popcorn sieve illustrated in FIG. 1; and,

FIG. 3 is a front elevational view thereof, the left side elevational view, the right side elevational view, and the rear elevational view are identical to FIG. 3. 

The ornamental design for a popcorn sieve, as shown and described. 